Add arbitrary yaml metadata from tier as sponsor claims

[kzu]

As part of the tier description, sponsorables can add arbitrary yaml metadata such as:

<!-- tier: basic -->

Multiple values are supported in standard yaml format.

These claims are cumulative (i.e. tier 3 gets tier 2 and tier 1 metadata, with the closest tier to the actual sponsoring tier wins).

This now allows client code to selectively enable functionality based on GH sponsorship tier metadata.

Fixes #234

[devlooped-bot]

🧪 Details on Microsoft Windows 10.0.20348

✅ Devlooped.Tests.SponsorLinkTests.TryRead
❔ Devlooped.Tests.SponsorLinkTests.ValidateCachedManifest => Non-CI test
✅ Devlooped.Tests.SponsorLinkTests.ValidateExpiredSponsor
✅ Devlooped.Tests.SponsorLinkTests.ValidateSponsorable
✅ Devlooped.Tests.SponsorLinkTests.ValidateUnknownFormat
✅ Devlooped.Tests.SponsorLinkTests.ValidateWrongKey
✅ Tests.AnalyzerTests.WhenAnalyzerNotDirectlyReferenced_ThenDoesNotReport
✅ Tests.AnalyzerTests.WhenMultipleAnalyzers_ThenReportsOnce
✅ Tests.AnalyzerTests.WhenNoAdditionalFiles_ThenReportsUnknown
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "contrib,oss", status: Contributor)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "contrib,team", status: Team)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "contrib", status: Contributor)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "org,contrib", status: Contributor)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "org,oss", status: Organization)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "org", status: Organization)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "oss", status: OpenSource)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "team", status: Team)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "user,contrib,team", status: Team)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "user,org,contrib", status: User)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "user,oss", status: User)
✅ Tests.AnalyzerTests.WhenSponsoringRole_ThenEnsureStatus(roles: "user", status: User)
✅ Tests.AnalyzerTests.WhenUnknownAndGrace_ThenDoesNotReport
✅ Tests.AnalyzerTests.WhenUnknownAndGraceExpired_ThenReportsUnknown
✅ Tests.AnalyzerTests.WhenUnknownAndNoGraceOption_ThenReportsUnknown
✅ Tests.Sample.RenderSponsorables
✅ Tests.Sample.Test(culture: "", kind: Contributor)
✅ Tests.Sample.Test(culture: "", kind: Expired)
✅ Tests.Sample.Test(culture: "", kind: Expiring)
✅ Tests.Sample.Test(culture: "", kind: Unknown)
✅ Tests.Sample.Test(culture: "", kind: User)
✅ Tests.Sample.Test(culture: "en", kind: Contributor)
✅ Tests.Sample.Test(culture: "en", kind: Expired)
✅ Tests.Sample.Test(culture: "en", kind: Expiring)
✅ Tests.Sample.Test(culture: "en", kind: Unknown)
✅ Tests.Sample.Test(culture: "en", kind: User)
✅ Tests.Sample.Test(culture: "es-AR", kind: Contributor)
✅ Tests.Sample.Test(culture: "es-AR", kind: Expired)
✅ Tests.Sample.Test(culture: "es-AR", kind: Expiring)
✅ Tests.Sample.Test(culture: "es-AR", kind: Unknown)
✅ Tests.Sample.Test(culture: "es-AR", kind: User)
✅ Tests.Sample.Test(culture: "es", kind: Contributor)
✅ Tests.Sample.Test(culture: "es", kind: Expired)
✅ Tests.Sample.Test(culture: "es", kind: Expiring)
✅ Tests.Sample.Test(culture: "es", kind: Unknown)
✅ Tests.Sample.Test(culture: "es", kind: User)

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